I have that rack. I have a RadRunner Plus which weighs 74 lbs and it fits on very securely. I?m really nervous about hauling my expensive ebike around but so far it doesn?t seem to move a bit. I strap it down good and away I go. My only dislike of this rack is that it is heavy (50 lbs) and a handful to get started into the hitch receiver on my SUV. it also is quite large and does not fold up so storing it in my garage is a bit of a challenge.